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' 0. L. 'PLEISOHMAN-N.

Duplex Pedal Motor.

No.'230,41l.' Patented July 27,1880.

N-FETER8, FHOTO-LITHOWHEE'WASHING'ION.

' UNITED STATES PATENT OFFICE,

CHARLES L. FLEISCHMANN, OF WASHINGTON, DISTRICT OF COLUMBIA.

DUPLEX PEDAL MOTOR.

SPECIFICATION forming part of Letters Patent No. 230,411, dated July 27, 1880.

Application filed March 31, 1880. (No model.)

To all whom it may concern Be it known that LCHARLES LOUIS'FLEISCH- MANN, of the city of Washington, in the District of Columbia, have invented a new Mechanism called the Duplex Pedal Motor, for working sewing-machines, ofwhich the following is a specification.

The common treadle now in general use has to overcome with an exceedingly short leverage the weight and friction of the vari-,

ous parts of the sewing-machine-for instance, first, the foot-plate of the treadle; second, the pitman; third, the crank; fourth, the large band-wheel; fifth, the small band-wheel; sixth, thefly-wheel; seventh, the gearing and all the moving parts of the sewing'machine proper, and, finally, the material which has to be made up. All those various parts are lifted and depressed with a leverage of six inches for the toe part and six inches for the heel part of the treadle.

Now, when we consider that almost all sewing-machines are Worked by females, whom nature has allotted less muscular power and a very short foot, with which they are not able to span the foot-plate of a treadle, we can easily understand the general complaints against the working of sewing-machines. Yet all the aboveenumerated parts are indispensable to obtain the necessary speed and action in sewing-machines, and any alteration in sewing-machines as to the weight or size of any one of the specified parts does not remedy theexisting difficulties. It requires a radical change to remove the objections, and my improvements have the object to make that change-first, by an increase of leverage, and, second, by a considerable decrease of the foot motion. I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure l is a perspective view of the rocking lever, showing the mode of attaching the pedal-rods thereto and the position of the foot-rest. Fig. 2 is a detailed view of the rocking lever and the pedal-rods. Fig. 3 is a side view of the rocking let er, the pedal-rod, and the foot-rest.

Similar letters refer to similar parts through out the views.

The rocking lever A, having its fulcrum at ing shorter segments of a circle than the ends 7 of the lever A. The rocking motion which the pedal-rods have in common with the lever A diminishes gradually and becomes almost nought at F F, where the pedal-rods turn in sockets. The pedal-rods are from twenty to twenty-four and more inches in length, and they exert considerable leverage at the rocking lever A, so that that lever requires little power to raise or depress it, and it is easy to calculate how much less power it takes to work the rocking lever A and its appendages with twenty-'four-inch levers instead of with sixinch leverages as is the casein the common treadle.

At the rocking lever A the pedal-rods D E are from four to more inches apart, and they run parallel with the foot-rest G, upon which the foot is placed to work the pedal-rods. The foot rests with the toes on the pedal-rod E, the heel on the pedal-rod D. The foot-rest G is placed about half-way between the rocking lever A and the socket at F F.

Instead of the foot-rest, a treadle may be. used in place of it, which overlaps with its ends both pedal-rods. When the foot depresses or .raises one of the pedal-rods it produces a rocking motion of the lever A. This motion gradually decreases along the pedalrods D .E, and as it approaches the sockets F F it almost ceases. At half the length of the pedal-rods the rise or fall of said rods is only about one inch, and it is there where the foot is placed to operate the pedals. To elevate the foot one inch and depress it one inch require scarcely any effort, and that slight motion neither causes strain on the foot nor produces any injurious consequences, as is the case. with the common treadle. In a machine with a common treadle, working a twoinch crank, the ends of the treadle have to be raised four inches and depressed the same number of inches, so that at every revolution of the crank the treadle motion amounts to eight inches, whereas in the duplex pedal motor the foot has only to be raised one inch IOO and depressed another inch, making at every sweep of the crank a saving of about seventyfive per cent. of foot motion over the treadle motion.

It is obvious that the duplex pedal motor 'can be worked with considerable less power and with an increased gain of fast motion, and a person even at a tenrlermge can work the sewing-machine without experiencing any one of the injurious consequences the common treadle is liable to produce.

The duplex pedal motor can be worked twice as fast in the same space of time as the common treadle now in use, it requiring only a tap with the toes and heel of the foot to pro- 

